This happened to me too. Hold the volume power button and the seek next button together for about 10 seconds, that should do a soft reset. It fixed it for me.
This happened to me a few months ago, lasted a few days and went away on its own. Hasn’t come back since.
If you’re using CarPlay, it can get weird if you don’t use the official Apple cable. Some aftermarket cables work fine, though, just trial and error.
Mine did the same thing, but it wasn’t the screen. It was either the cable or software and went away on its own after a few power cycles.
If it was fixed by power cycles, it’s probably a software or display issue.